Function mcShellMeshRegion

source/MRVoxels/MROffset.cpp:242–272

}

Expected<Mesh> mcShellMeshRegion( const Mesh& mesh, const FaceBitSet& region, float offset,
    const BaseShellParameters& params, Vector<VoxelId, FaceId> * outMap )
{
    MR_TIMER;

    DistanceVolumeParams dvParams;
    dvParams.cb = subprogress( params.callBack, 0.0f, 0.5f );
    auto absOffset = std::abs( offset );
    const auto box = mesh.computeBoundingBox( &region ).expanded( Vector3f::diagonal( absOffset ) );
    const auto [origin, dimensions] = calcOriginAndDimensions( box, params.voxelSize );
    dvParams.origin = origin;
    dvParams.voxelSize = Vector3f::diagonal( params.voxelSize );
    dvParams.dimensions = dimensions;

    auto volume = meshRegionToIndicatorVolume( mesh, region, offset, dvParams );
    if ( !volume )
        return unexpectedOperationCanceled();

    MarchingCubesParams vmParams;
    vmParams.origin = dvParams.origin;
    vmParams.iso = 0;
    vmParams.cb = subprogress( params.callBack, 0.5f, 1.0f );
    vmParams.lessInside = true;
    vmParams.outVoxelPerFaceMap = outMap;
    vmParams.freeVolume = [&volume]
    {
        Timer t( "~SimpleVolume" );
        volume = {};
    };
    return marchingCubes( *volume, vmParams );
}

Expected<Mesh> sharpOffsetMesh( const MeshPart& mp, float offset, const SharpOffsetParameters& params )
{